Revert rake test changes

Author: alexeyr

CHANGELOG.md

@@ -15,6 +15,8 @@ If you think ShakaCode can help your project, [click here](https://meetings.hubs
 Please follow the recommendations outlined at [keepachangelog.com](http://keepachangelog.com/). Please use the existing headings and styling as a guide, and add a link for the version diff at the bottom of the file. Also, please update the `Unreleased` link to compare to the latest release version.
 
 ## Versions
+
+### [Unreleased]
 Changes since the last non-beta release.
 
 ### [15.0.0-alpha.2] - 2025-03-07

rakelib/release.rake

@@ -89,9 +89,7 @@ end
 # rubocop:enable Metrics/BlockLength
 
 task :test do
-  bundle_install_in(gem_root)
-  bundle_exec(gem_root, "rake update_changelog")
   unbundled_sh_in_dir(gem_root, "cd #{dummy_app_dir}; bundle update react_on_rails")
-  sh_in_dir(gem_root, "git commit -a -m 'Update Gemfile.lock and CHANGELOG.md'")
+  sh_in_dir(gem_root, "git commit -a -m 'Update Gemfile.lock for spec app'")
   sh_in_dir(gem_root, "git push")
 end